Investigation of critical material removal transitions in compliant machining of brittle ceramics

Wu Le Zhu, Beaucamp Anthony

研究成果: Article査読

17 被引用数 (Scopus)

抄録

Compliant machining processes, such as bonnet polishing, can be used on hard and brittle ceramic materials such as alumina and silicon carbide, to produce ultra-precise surfaces with sub-micron form accuracy and nanometric surface roughness. However, a comprehensive understanding of the removal mechanism in such process is lacking. In this paper, an analytical model is proposed that is based on the existence of “three zones” in compliant machining process, namely elastic recovery, plastic removal and brittle fracture. The inherent relationships of the three critical pressures with actual pressure, due to compression of the elastic bonnet tool and asperity effect, are established and analyzed in association with different material removal behaviors. Analysis indicates that pad asperity plays an important role in material removal and that lower material hardness combined with higher tensile strength contributes to enlarged plastic removal zone, and thus higher manufacturability. Removal footprints and polishing tests were then generated to verify accurate prediction of the material removal rate under different conditions and demonstrate effectiveness of the proposed model.

本文言語English
論文番号108258
ジャーナルMaterials and Design
185
DOI
出版ステータスPublished - 2020 1月 5
外部発表はい

ASJC Scopus subject areas

  • 材料科学一般
  • 材料力学
  • 機械工学

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